Improvement in steam-valves



UNITED t STATES PATENT OFFICE.`

IMPROVEMENT IN STEAM-VALVES` Specilicatin forming part of Letters Patent No. 49,414, dated August 15, 1865.

To'dll whom it may concern.'

Be it known that I, JOHN JOHNSON, ot' the city and State ot' New York, have invented,

made, and applied to use a certain new and useful Improvement in Steam-Cocks; land I do hereby declare the following to be a full, clear, and exact description ot' the said invention, reference being had to the annexed drawings, making part otl this specification, wherein- Figure l is a Vertical longitudinal section ot the said cock, and Fig. 2 is a sectional plan at the line x m. t

Similar letters denote the same parts. Steaincocks have heretofore been made with a valve on the end ot' a screw-rod titting a seatin a central diaphragm. Said valves have, however, in most instances, been rotated as they were forced toward the seat. This requires the exertion of considerable power, particularly with large Valves, to turn them until they sit tightly upon the seat, and any inaccu racy Ot' workmanship increases this difficulty.

The nature ot' my said invention consists in a metallic valve taking a rib-seat, and guided so as to rise and be pressed down by the action ot' a screw, said screw being on a rod passing through ground-disks that take against a collar on the said rod, thereby making the parts steanrtight without the use of any leather or` other washers. My valveis not subject to injury by thc steam-heat, as valves Of this character usually are, because metallic parts only are employed, and the valve itself has no turning motion on its seat.

In the drawings, tt is'the body of the cock, with coupling-screws atb b ,or the steam-pipes, and a diaphragm, c, in which is the Opening, as usual. Around this opening is a rib, v, forming the valve-seat, which seat, being raised, is less likely to retain any grit or foreign substance than the usual conical seat.

d is the valve occupying the cylindrical portion e ot' the valve-body, and guided therein by feathers o o, (see Fig,H 2,) taking correspond-` ing grooves on the inside of the cylinder e.

f is a rod, at the upper end ot' which is a handle Or wheel, g, and at the lower end is a screw-thread takinga corresponding thread on the inside ot the valve d. y

t is a conical collar around said valve-rod f, occupying recesses in the plates k and l, which plates are formed as perforated disks, ground t into place in the cylinder e and against the collar h, so as to be steamtight when pressed together against the said collar l1, by the cap m that screws on around the outside end of the cylinder e. h

My improved steam-cock is durable, unaffected by the heat, and steam-tight, whether Open or closed, and that regardless of the direction in which the steam enters or leaves the cock. t

What I claim, and desire to secure by Letters Patent, is-

The valve d, guided in the cylindere, and taking a rib-formed seat upon the diaphragm,

in combination with the screw-rod f, collar It,

and disksk and Z, forthe purposes and as specitied.

In witness whereot'I have hereunto set my signature this 15th dayof `I\Iay,t1865.

' JOI-IN JOHNSON.

Witnesses: i

THOs. GEO. HAROLD, Guns. H. SMITH. 

